PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-21:58:10
G01     241.3          29.6               10.5 +/-    1.32      18.5 +/-    1.32  0.030 / 0.030
G03     312.3          52.9                7.5 +/-    0.48       9.1 +/-    0.48  0.040 / 0.040
G14     69.9           35.1                7.3 +/-    0.79      11.5 +/-    0.79  0.090 / 0.130
G16     161.4          25.2               12.4 +/-    2.22      24.0 +/-    2.22  0.090 / 0.120
G22     286.0          72.9               10.0 +/-    0.75      10.4 +/-    0.75  0.080 / 0.230
G23     293.5          24.7                8.5 +/-    1.16      16.7 +/-    1.16  0.070 / 0.230
G26     128.7          45.0               10.5 +/-    1.36      14.2 +/-    1.36  0.020 / 0.040
G31     39.9           50.7                6.0 +/-    0.39       7.5 +/-    0.39  0.030 / 0.050
G32     84.9           17.7                7.9 +/-    0.73      18.3 +/-    0.73  0.050 / 0.150